Antenna base



FIG. 1 is a top perspective view of an antenna base showing my newdesign, the antenna shown in broken lines for illustrative purposes onlyand forms no part of the claim;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a bottom perspective view thereof.

The ornamental design for an antenna base, as shown and described.